Patch "drm/i915: refine qemu south bridge detection" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

drm/i915: refine qemu south bridge detection

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-i915-refine-qemu-south-bridge-detection.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Gerd Hoffmann <[email protected]>
Date: Mon, 25 Jan 2016 12:02:28 +0100
Subject: drm/i915: refine qemu south bridge detection
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From: Gerd Hoffmann <[email protected]>

commit f2e305108faba0c85eb4ba4066599decb675117e upstream.

The test for the qemu q35 south bridge added by commit "39bfcd52 drm/i915: more virtual south bridge detection" also matches on real hardware. Having the check for virtual systems last in the list is not enough to avoid that ...

Refine the check by additionally verifying the pci subsystem id to see whenever it *really* is qemu.

[ v2: fix subvendor tyops ]

---
 drivers/gpu/drm/i915/i915_drv.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

@@ -532,7 +532,9 @@ void intel_detect_pch(struct drm_device
 				DRM_DEBUG_KMS("Found SunrisePoint LP PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev));
 			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
-				   (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE)) {
+				   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
+				    pch->subsystem_vendor == 0x1af4 &&
+				    pch->subsystem_device == 0x1100)) {
 				dev_priv->pch_type = intel_virt_detect_pch(dev);
 			} else
 				continue;

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/drm-i915-more-virtual-south-bridge-detection.patch queue-4.4/drm-i915-refine-qemu-south-bridge-detection.patch